Beenhaed flegk



(No Model.)

B. FLEGK.

MILITARY DRUM.

No. 388,771. Patented Aug. 28,1888.

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UNITED STATES PATENT OFFICE.

BERNHARD FLEGK, OF MljHLHAUSEN, THUBINGIA, ASSIGNOR TO HEILBRUNN SCENE, OF ERFURT, GERMANY.

MILITARY DRUM.

SPECIFICATION forming part of Letters Patent No. 388,771, dated August 28, 1888.

Application filed November .19, 1887. Serial No. 256,474. (No model.) Patented in Germany June 10. 1885, No. 34,594; in Austria-Hungary January 25, 1886, No. 38,935; in England June 29, 1886, No. 8,553, and in Italy June 30, 1886. No. 20,235.

To all whom it may concern.-

Be it known that I, BERNHARD FLEOK, of Miihlhausen, Thuringia, Germany, have invented a new and useful Improvement in Military Drums, (which has been patented in the following countries: in Germany June 10, 1885, No. 31,591; in England June 29, 1886, No. 8,553; in AustriaHungary January 25, 1886, No. 38,935, and in Italy June 30, 1886, No. 20,235,) of which the following is aspecification.

This invention relates to an arrangement for tightening or loosening the drum-heads of a drum; and it consists in the attachment of in clined ways to the upper drum-head ring, upon which rods embracing the lower drumhead are made to slide.

In theaccompanying drawings,Figu re 1 represents an outside view of a drum embodying my invention. Fig. 2 is a top view ofthe same. Fig. 3 is a section atline B B, Fig. 1; and Fig. 4 a section at line D D, Fig. 1.

Flanges a of the drum-head rings 1) press upon the projecting edges or ends 0 of the dru 111- head skin S, and stretch thereby said skins over the drum-body A. Around the upper drum-head b a ring, (1, is placed, having an inwardly-projecting flange, d, resting upon said ring I). A small gear-wheel, h, is attached to this ring (I, meshing into a perforated ring, p, forming a rack attached to the flange a of upper drumhead ring I), whereby said ring d can be turned backward or forward. To this ring 11 inclined ribs 6 are attached parallel to each other.

f f are rods arranged around the body A of the drum and guided in suitable recesses made in the flanges a of rings 1). The lower ends of these rods are attached to the lower ring I), and the upper ends of said rods are provided with projecting noses 2', resting upon the inclined rib eon ring (I.

\Vhen the ring (1 is turned, say, to the left, by means of the small gear-wheel h, the ends of the rodsf will move up the inclined surfaces e,

and force thereby the rings 1) toward each other, which by their action upon the ends of the drum-head skins S will tighten the same, while when said ring (Z is moved in the opposite direction, toward the right, the rods f move down the inclined surfaces 6, whereby the pressure is taken off the rings 1), and consequently the drum-head skins loosened.

Instead of attaching the lower ends of the rodsf to the lower drum-head b,arms in may be attached to the rods f, supportingascrew-bolt, a, the lower ends of which are connected by cords o with flange a of thelower drum-head I). (See Fig. 1.)

hat I claim is- In a drum, the combination of ring d with inclined surfaces 6 6 around the upper drumhead, with rodf attached to the lower drumhead and sliding upon theinclined surfaces P, and with means of turning the ring (Z, substantially as and for the purpose specified.

In testimony whereofl havesigned my name to this specification in the presence of two subscribing witnesses.

BERNHARD FLECK.

W'itncsses:

OOTAVIO KNASSBY, API-IONS JAOOBWAY. 

